JP2021065591A - Chair - Google Patents

Abstract

To suppress a local load to a seat, caused by positional deviation.SOLUTION: A chair comprises: a seat 2 having a seating face allowing a seated person to sit; and a support structure 3 supporting the seat 2 rotatably around a shaft along the longitudinal direction between a usage state of allowing the seated person to sit and a storage state of standing with respect to the usage state. The seat 2 has a projection part 22 projecting to an opposite side to the seating face, and the support structure 3 has a leg side connection member 31 for connecting a pair of leg constitutional members separated from each other in the longitudinal direction. The leg side connection member 31 has a guide surface 40a for guiding the projection part 22 in a process that the seat 2 is shifted from the storage state to the usage state so as to position a tip 22p of the projection part 22 in the usage state in a target position TP in the front-back direction.SELECTED DRAWING: Figure 10

Description

The present invention relates to a chair.

Conventionally, in a chair, an axis around the width direction of the chair between a seat having a seating surface on which the seated person can be seated and a used state in which the seated person can be seated and a stored state in which the seat is upright with respect to the used state. A support structure that rotatably supports the chair is known.
For example, in Patent Document 1, the seat includes a seat body that supports the upholstery by a seat frame, and a seat frame that supports the seat body. The seat frame is rotatably supported with respect to the support structure via a shaft member. The seat frame includes a frame frame portion adjacent to the lower surface of the seat frame and a horizontal frame portion erected on the frame frame portion. The support structure includes a pair of left and right leg components and a joint material that connects the left and right leg components. The joint material functions as a seat support that can support the seat from below. The joint material has a prismatic shape extending in the left-right direction. The joint material has an upward surface that is substantially horizontal. The lower surface of the horizontal frame portion of the seat in use is in contact with the upward surface of the joint material.

Japanese Unexamined Patent Publication No. 2019-63166

However, if the upward surface of the joint material is substantially horizontal, the front-back direction (chair depth direction) in the used state due to dimensional errors during molding and processing that occur in the seat and each member constituting the support structure. ) May be displaced from the position of the joint material and the horizontal frame. In this case, the local load on the seat due to the misalignment may increase.

In view of the above circumstances, an object of the present invention is to provide a chair capable of suppressing a local load on the seat due to misalignment.

The chair according to one aspect of the present invention has a seat having a seating surface on which a seated person can be seated, and a storage state in which the seat can be seated by the seated person and an upright storage state with respect to the used state. The seat comprises a support structure that rotatably supports around an axis along the width direction of the chair, the seat has a protrusion that projects toward the side opposite to the seating surface, and the support structure is A leg-side connecting member for connecting a pair of leg-constituting members separated in the width direction is provided, and the tip of the protruding portion of the leg-side connecting member is positioned at a target position in the depth direction of the chair in the used state. The seat is characterized by having a guide surface that guides the protruding portion in the process of shifting from the stored state to the used state.

According to this configuration, the seat is guided by guiding the protrusion in the process of shifting from the retracted state to the used state so that the tip of the protrusion is located at the target position in the depth direction of the chair when the guide surface is in use. And even if there is a dimensional error during molding or processing in each member constituting the support structure, the tip of the protruding portion can be aligned with the target position in the depth direction of the chair in the used state. Therefore, it is possible to suppress the local load on the seat due to the misalignment.

In one aspect of the present invention, in a cross-sectional view orthogonal to the width direction, the protrusion has an arcuate surface that is convex toward the side opposite to the seating surface, and the guide surface is the arcuate surface. It may be recessed corresponding to the convexity of the surface and have an arc shape larger than the radius of curvature of the arcuate surface.
According to this configuration, since each of the arcuate surface and the guide surface of the protruding portion has an arcuate shape, both surfaces are easily adapted in the used state, so that the local load on the seat is suppressed more effectively. be able to.

In one aspect of the present invention, the seat includes a pair of rod members that are separated from each other in the width direction and a seat-side connecting member that connects the pair of rod members to each other, and the protruding portion is in the used state. The seat-side connecting member may be provided at a portion facing the leg-side connecting member.
According to this configuration, the seat-side connecting member is required to have a large strength because of the function of connecting the pair of rods to each other, but the protruding portion is the leg-side connecting member in the seat-side connecting member. By being provided at the opposing portions, it is possible to maintain the robustness in the state where the protruding portion and the leg-side connecting member are in contact with each other (used state).

In one aspect of the present invention, the seat-side connecting member is bent toward the pair of rods from the outer end of the extending portion extending in the width direction toward the pair of rods, and the seating surface is attached to the pair of rods. It is provided with a bent portion connected from the opposite side to the above, and in a cross-sectional view orthogonal to the width direction, the bent portion has a convex arc shape toward the side opposite to the side on which the seating surface is provided. May be good.
According to this configuration, since the bent portion (the connecting portion of the seat-side connecting member to the rod member) has an arc shape, it is possible to maintain the robustness against the seating load. For example, when a load is applied to the seat-side connecting member during seating, a moment load is generated centering on the connecting portion between the outer end in the width direction of the seat-side connecting member and the rod member, but the bent portion has an arc shape. This makes it possible to maintain robustness against moment loads.

In one aspect of the present invention, the extending portion has an arc-shaped recessed abutting surface along the guide surface, and includes an elastically deformable abutting portion with which the protruding portion abuts in the used state. May be good.
According to this configuration, since the abutting surface of the abutting portion has an arc shape along the guide surface, the arcuate surface of the protruding portion and the abutting surface of the abutting portion are easily familiar with each other in the used state. The local load can be suppressed more effectively. In addition, since the protruding portion abuts on the elastically deformable abutting portion in the used state, the impact such as when sitting can be absorbed by the abutting portion.

In one aspect of the present invention, a plurality of the contact portions may be provided at intervals in the width direction.
According to this configuration, the local load on the seat can be more effectively suppressed by providing the plurality of contact portions. In addition, the impact at the time of sitting can be absorbed by the plurality of contact portions.

According to the present invention, it is possible to suppress a local load on the seat due to misalignment.

The perspective view of the chair which concerns on embodiment. The front view of the chair which concerns on embodiment. The left side view of the chair according to the embodiment. Top view of the chair according to the embodiment. The bottom view of the chair according to the embodiment. The left side view of the stored state of the seat which concerns on embodiment. Top view of the seat side connecting member according to the embodiment. Front view including a VIII-VIII cross section of FIG. Left side view including the IX-IX cross section of FIG. Left side view including the XX cross section of FIG. 7. Left side view including the XI-XI cross section of FIG. The operation explanatory view of the front surface of the guide which concerns on embodiment. The operation explanatory view of the guide rear surface which concerns on embodiment. The schematic diagram of the guide surface which concerns on the modification of embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the same reference numerals are given to the same configurations. In the embodiment, as an example of the chair, the width of the chair is between a seat having a seating surface on which the seated person can be seated and a used state in which the seated person can be seated and a stored state in which the seat is raised with respect to the used state. A chair provided with a support structure that rotatably supports around an axis along a direction will be described. In the embodiment, the installation surface on which the chair is installed is a horizontal surface.

[Chair]
As shown in FIG. 1, the chair 1 includes a seat 2, a support structure 3, a backrest 4, and an armrest 5. The seat 2, the backrest 4, and the armrest 5 are supported by the support structure 3. 1 to 5 show a usage state of the seat 2. FIG. 6 shows the stored state of the seat 2.

In the following description, unless otherwise specified, the orientations such as front-back, up-down, left-right, etc. are defined as "front" on the front side of the seated person seated in the normal posture on the seat 2 in the used state of the chair 1 installed on the horizontal plane. The other side will be described as "after". That is, the direction orthogonal to the paper surface shown in FIG. 2 is defined as the "front-back direction (depth direction of the chair 1)". Further, the normal direction (vertical direction) of the horizontal plane is defined as the "vertical direction (height direction of the chair 1)". Further, the direction orthogonal to each of the front-rear direction and the up-down direction is defined as the "left-right direction (width direction of the chair 1)". In the figure, the front is indicated by an arrow FR, the upper part is indicated by an arrow UP, and the left side is indicated by an arrow LH.

[seat]
As shown in FIG. 1, the seat 2 includes an upholstery 10 (seat surface constituent member) having a seating surface 10a on which a seater can sit, a rectangular frame-shaped seat frame 11 on which the upholstery 10 is stretched, and the like. A seat side connecting member 12 extending in the left-right direction is provided. In the seat 2, the seat side connecting member 12 (seat side facing surface 12a) is in contact with the leg side connecting member 31 (leg side facing surface 31a) in the used state (see FIG. 8). For example, the seat frame 11 and the seat side connecting member 12 are integrally formed of the same member (for example, a resin member).

The upholstery 10 has a stretchable (elastically deformable) sheet shape. The outer peripheral portion of the upholstery 10 is supported by the seat frame 11 in a state where the upholstery 10 is pulled in the front-rear direction and the left-right direction. The portion of the upholstery 10 inside the seat frame 11 (seat surface 10a) is elastically deformable in the vertical direction.

As shown in FIG. 4, the seat frame 11 includes a pair of rod members 15 that are separated from each other in the left-right direction. The rod material 15 extends in the front-rear direction. The left and right pair of rods 15 support the left and right ends of the upholstery 10 (see FIG. 1). The stretched ground 10 is stretched between the pair of rods 15 by the end portion of the stretched ground 10 being supported by the rod 15 so as not to fall off (see FIG. 8).

The seat side connecting member 12 connects a pair of left and right rod members 15 to each other. The seat-side connecting member 12 has a seat-side facing surface 12a (lower surface) facing the leg-side connecting member 31 when the seat 2 is in use (see FIG. 8). As shown in FIG. 8, the seat side connecting member 12 includes a seat side extending portion 20 (extending portion) extending in the left-right direction and a pair of left and right rod members 15 from the outer end of the seat side extending portion 20 in the left-right direction. A bent portion 21 that bends toward is provided.

As shown in FIG. 10, the seat-side extending portion 20 has a protruding portion 22 that projects toward the side opposite to the seating surface 10a (see FIG. 1) (lower side of the seat 2 in the used state). In the cross-sectional view of FIG. 10 (cross-sectional view orthogonal to the left-right direction), the protruding portion 22 has an arc-shaped surface 22a forming a convex arc shape toward the side opposite to the seating surface 10a. The protruding portion 22 is provided at a portion where the seat side connecting member 12 faces the leg side connecting member 31 when the seat 2 is in use. The protruding portion 22 is provided over the entire seat side extending portion 20 in the left-right direction. In the used state of the seat 2, the tip 22p of the protruding portion 22 is located at the lower end of the seat-side extending portion 20.

The seat-side extending portion 20 has a groove portion 23 extending in the left-right direction (see FIG. 9). As shown in FIG. 9, the groove portion 23 is formed on the seat side facing surface 12a. A pair of groove portions 23 are provided at intervals in the front-rear direction in the used state. The pair of front and rear groove portions 23 have substantially the same length in the left-right direction. In the used state, both ends of the groove portion 23 in the left-right direction overlap with a pair of left-right abutting portions 45 when viewed from the vertical direction.

As shown in FIG. 8, the bent portion 21 is connected to the pair of rod members 15 from the side opposite to the seating surface 10a (see FIG. 1). The bent portion 21 is connected to the pair of rod members 15 from the lower side of the seat 2 in the used state. In the top view of FIG. 7, the length of the bent portion 21 in the front-rear direction gradually increases toward the outside in the left-right direction. In the cross-sectional view of FIG. 11 (cross-sectional view perpendicular to the left-right direction), the bent portion 21 has a convex arc shape toward the side opposite to the seating surface 10a (see FIG. 1).

The seat side connecting member 12 has a convex arc shape toward the side opposite to the seating surface 10a (see FIG. 1) in a cross-sectional view (cross-sectional view of FIGS. 10 and 11) orthogonal to the left-right direction. In the used state, the height of the seat side connecting member 12 in the vertical direction gradually decreases toward the inside (central portion 25) in the horizontal direction (see FIG. 8). As shown in FIG. 8, the seat side connecting member 12 includes a central portion 25 located at the center in the left-right direction, and a reinforcing portion 26 connecting the outer end of the central portion 25 in the left-right direction and a pair of left and right rod members 15. , Equipped with.

As shown in FIG. 7, the central portion 25 is located at the center of the seat side extending portion 20 in the left-right direction. The central portion 25 is a portion of the seat side connecting member 12 that does not have ribs 28A to 28C (a portion inside the central rib 28A in the left-right direction from the inner end in the left-right direction). The central portion 25 is a portion facing the center of the buttocks of the seated person when the seat 2 is in use.

In the used state, the height of the central portion 25 in the vertical direction (hereinafter, also simply referred to as “central portion height”) is the height of the reinforcing portion 26 in the vertical direction (hereinafter, also simply referred to as “reinforcing portion height”). Lower than (see FIG. 8). Here, the height of the central portion means the height from the reference at the position where the height from the reference (for example, the installation surface of the chair 1) is the highest in the entire left-right direction of the central portion 25. As shown in FIG. 8, the height of the upper end of the reinforcing portion height H2 is higher than that of the central portion height H1 in the entire left-right direction (H2> H1). In other words, the vertical dimension of the distance formed between the seating surface 10a and the upholstery 10 when the seating surface 10a is not loaded is smaller in the reinforcing portion 26 than in the central portion 25. In use, the height of the central part is uniform throughout the left-right direction. In the used state, the height of the reinforcing portion gradually decreases toward the inside (center portion 25) in the left-right direction.

The reinforcing portion 26 has higher rigidity against bending deformation in the vertical direction than the central portion 25. The reinforcing portion 26 has a larger cross-sectional area than the central portion 25 in a cross-sectional view orthogonal to the left-right direction (see FIG. 10). As shown in FIG. 10, the reinforcing portion 26 includes a plate-shaped portion 27 having a thickness in the vertical direction in the used state, and ribs 28A to 28C protruding upward from the plate-shaped portion 27 in the used state. The reinforcing portion 26 is a portion of the seat side connecting member 12 having ribs 28A to 28C.

The ribs 28A to 28C have a thickness in the front-rear direction in the used state. The thickness of the ribs 28A to 28C is preferably substantially the same as the thickness of the plate-shaped portion 27. The ribs 28A to 28C extend in the left-right direction. The height of the ribs 28A to 28C in the used state gradually decreases toward the inside in the width direction (see FIG. 8, and only the rib 28A is shown in FIG. 8). A plurality of ribs 28A to 28C (for example, three in the present embodiment) are provided at intervals in the front-rear direction in the used state (see FIG. 7).

As shown in FIG. 7, the three ribs 28A to 28C are a central rib 28A located in the center in the front-rear direction in the used state, a front rib 28B located in front of the central rib 28A in the used state, and a center in the used state. The rear rib 28C, which is located behind the rib 28A. The central rib 28A has a larger length in the left-right direction than each of the front rib 28B and the rear rib 28C. The front rib 28B and the rear rib 28C have substantially the same length in the left-right direction. The inner end of the central rib 28A in the left-right direction is located inside the contact portion 45 in the left-right direction (see FIG. 8).

[Support structure]
As shown in FIG. 1, the support structure 3 includes a pair of left and right leg constituent members 30, and a leg-side connecting member 31 that connects the pair of left and right leg constituent members 30 to each other.
The leg component 30 includes a front leg portion 35, a rear leg portion 36 located behind the front leg portion 35, a seat mounting portion 37 that pivotally supports both left and right side portions behind the seat 2, and left and right end portions of the backrest 4. It is provided with a back support portion 38 for supporting the above.

In the side view of FIG. 3, the front leg portion 35 extends so as to be positioned forward toward the lower side.
The hind legs 36 extend so as to be located rearward toward the lower side. The rear end of the front leg 35 is connected to the vicinity of the center of the rear leg 36 in the vertical direction.
Caster 39s are attached to the lower ends of the front leg portion 35 and the rear leg portion 36.

The seat mounting portion 37 is provided above the connecting position of the front leg portion 35 on the rear leg portion 36. The seat mounting portion 37 extends forward from the rear leg portion 36.
As shown in FIG. 1, the back support portion 38 extends upward from the upper end of the rear leg portion 36. The back support portion 38 is inserted into openings (not shown) at both left and right ends of the backrest 4. The back support portion 38 is screwed to the backrest 4 from the side together with the armrest 5.

As shown in FIG. 8, the leg-side connecting member 31 has a leg-side facing surface 31a (upper surface) facing the seat-side facing surface 12a in the used state. As shown in FIG. 2, the leg-side connecting member 31 includes a leg-side extending portion 40 extending in the left-right direction and a pair of left-right leg component members 30 (front leg portion 35) from the left-right outer end of the leg-side extending portion 40. ), And the inclined connecting portion 42 that connects the outer end of the inclined extending portion 41 in the left-right direction and the pair of left and right leg constituent members 30 (front leg portions 35). To be equipped. For example, the leg-side extending portion 40, the pair of left and right inclined extending portions 41, and the pair of left and right inclined connecting portions 42 are integrally formed of the same member (for example, a resin member).

The leg-side extending portion 40 supports the seat-side extending portion 20 from below while the seat 2 is in use. In the top view of FIG. 4, the length of the leg-side extending portion 40 in the front-rear direction is larger than that of the seat-side extending portion 20 over the entire left-right direction.

As shown in FIG. 10, in the leg-side extending portion 40, the seat 2 is positioned so that the tip 22p (lower end) of the protruding portion 22 is located at the target position TP (see FIG. 12) in the front-rear direction when the seat 2 is in use. It has a guide surface 40a that guides the protruding portion 22 in the process of transitioning from the stored state to the used state. In the cross-sectional view of FIG. 10, the guide surface 40a is recessed corresponding to the convexity of the arcuate surface 22a of the protruding portion 22. In the cross-sectional view of FIG. 10, the guide surface 40a has an arc shape larger than the radius of curvature of the arcuate surface 22a.

The leg-side extending portion 40 includes a contact portion 45 that comes into contact with the seat-side facing surface 12a of the reinforcing portion 26 in the used state. A pair of abutting portions 45 are provided so as to be separated from each other in the left-right direction (see FIG. 8). As shown in FIG. 8, the pair of abutting portions 45 have substantially the same outer shape as each other. For example, the contact portion 45 is formed of an elastic member (buffer member) such as rubber. The contact portion 45 is a portion of the leg-side extending portion 40 that first contacts the seat-side facing surface 12a in the process of shifting the seat 2 from the stored state to the used state.

The contact portion 45 includes a contact body 46 having a contact surface 46a that contacts the seat side facing surface 12a in the used state, and a pair of left and right locking claws 47 extending downward from the contact body 46. As shown in FIG. 10, the leg-side extending portion 40 has an accommodating recess 48 accommodating the contact body 46 and a pair of left and right openings 49 opening the lower surface of the accommodating recess 48 in the vertical direction.

In the cross-sectional view of FIG. 10, the contact surface 46a has an arc shape that is larger than the radius of curvature of the arcuate surface 22a along the guide surface 40a. The contact body 46 is housed in the housing recess 48 with the contact surface 46a located above the guide surface 40a. The contact portion 45 is detachably attached to the leg-side extending portion 40 by locking each locking claw 47 to each opening 49 (see FIG. 8).

In the front view of FIG. 2, the inclined extending portion 41 is inclined and extended so as to be located outward in the left-right direction toward the lower side. In the side view of FIG. 3, the inclined extending portion 41 is inclined so as to be positioned rearward toward the lower side. In the side view of FIG. 3, the length in the direction orthogonal to the extending direction of the inclined extending portion 41 gradually increases toward the lower side.

In the side view of FIG. 3, the inclined connecting portion 42 (see FIG. 2) overlaps with the substantially central portion in the direction in which the front leg portion 35 extends. In the side view of FIG. 3, the inclined connecting portion 42 is located inside the outer edge of the front leg portion 35. The inclined connecting portion 42 is inclined and extends so as to be located forward along the front leg portion 35 toward the lower side. The lower end of the inclined extending portion 41 is connected to a substantially central portion in the direction in which the inclined connecting portion 42 extends. In the bottom view of FIG. 5, the length of the inclined connecting portion 42 in the front-rear direction gradually increases from the connecting position of the inclined connecting portion 42 and the inclined extending portion 41 toward the outside in the left-right direction. Both ends (ends in the front-rear direction) in the direction in which the inclined connecting portion 42 extends are screwed to the front leg portions 35 from the inside in the left-right direction.

[Action of guide surface]
The operation of the guide surface 40a will be described with reference to FIGS. 12 and 13.
The guide surface 40a guides the protruding portion 22 in the process of shifting from the retracted state to the used state so that the tip 22p of the protruding portion 22 is located at the target position TP in the front-rear direction in the used state of the seat 2. Here, the portion of the guide surface 40a on the front side of the target position TP is referred to as the "guide front surface 40a1", and the portion on the guide surface 40a on the rear side of the target position TP is referred to as the "guide rear surface 40a2". On the arcuate surface 22a of the protrusion 22, the portion on the front side of the tip 22p of the protrusion 22 is the "arc-shaped front surface 22a1" when the seat 2 is in use, and the portion on the rear side of the tip 22p of the protrusion 22 in the use state of the seat. It is referred to as "arc-shaped rear surface 22a2".

For example, as shown in FIG. 12, when the tip 22p of the protrusion 22 is deviated to one side (front side when the seat is in use) with respect to the target position TP, a part of the arcuate front surface 22a1 of the protrusion 22 is The seat 2 comes into contact with the guide front surface 40a1 in the process of transitioning from the stored state to the used state (see the two-dot chain line in FIG. 12). Then, the tip 22p of the protruding portion 22 is displaced rearward (in the direction of the arrow in FIG. 12) along the front surface 40a1 of the guide in the process of shifting the seat 2 from the retracted state to the used state, and gradually moves to the target position TP in the front-rear direction. Get closer. Then, in the used state of the seat 2, the tip 22p of the protruding portion 22 is arranged at the target position TP in the front-rear direction (see the solid line in FIG. 12).

For example, as shown in FIG. 13, when the tip 22p of the protrusion 22 is displaced to the other side (rear side when the seat is in use) with respect to the target position TP, a part of the arcuate rear surface 22a2 of the protrusion 22 is , The seat 2 comes into contact with the guide rear surface 40a2 in the process of shifting from the stored state to the used state (see the two-dot chain line in FIG. 13). Then, the tip 22p of the protruding portion 22 is displaced forward (in the direction of the arrow in FIG. 13) along the guide rear surface 40a2 in the process of shifting the seat 2 from the retracted state to the used state, and gradually moves to the target position TP in the front-rear direction. Get closer. Then, in the used state of the seat 2, the tip 22p of the protruding portion 22 is arranged at the target position TP in the front-rear direction (see the solid line in FIG. 13).

In the used state of the seat, the arcuate front surface 22a1 and the arcuate rear surface 22a2 of the protruding portion 22 face the guide front surface 40a1 and the guide rear surface 40a2, respectively. Since the arc-shaped front surface 22a1 and the guide front surface 40a1 and the arc-shaped rear surface 22a2 and the guide rear surface 40a2 each have an arc shape, the surfaces facing each other easily become familiar with each other in the used state of the seat 2.

[Action effect]
As described above, the chair 1 according to the above embodiment has a seat 2 having a seating surface 10a on which the seated person can be seated, and a storage state in which the seat 2 is upright with respect to the seated state and the used state. The seat 2 includes a support structure 3 that rotatably supports the state along an axis along the left-right direction, and the seat 2 has a projecting portion 22 that projects toward the side opposite to the seating surface 10a. The support structure 3 includes a leg-side connecting member 31 that connects a pair of leg-constituting members 30 that are separated from each other in the left-right direction. The seat 2 has a guide surface 40a that guides the protruding portion 22 in the process of shifting from the stored state to the used state so as to be located at the position TP.

According to this configuration, the protrusion 22 is guided in the process of shifting from the retracted state to the used state so that the tip 22p of the protrusion 22 is located at the target position TP in the front-rear direction while the guide surface 40a is in use. As a result, even if there is a dimensional error during molding or processing in each member constituting the seat 2 and the support structure 3, the tip 22p of the protruding portion 22 is set to the target position TP in the front-rear direction in the used state. Can be adjusted to. Therefore, it is possible to suppress the local load on the seat 2 due to the misalignment.

In the above embodiment, in a cross-sectional view orthogonal to the left-right direction, the protruding portion 22 has an arc-shaped surface 22a forming a convex arc shape toward the side opposite to the seating surface 10a, and the guide surface 40a is an arc-shaped surface 22a. It is recessed corresponding to the convexity and has an arc shape larger than the radius of curvature of the arcuate surface 22a.
According to this configuration, since each of the arcuate surface 22a and the guide surface 40a of the protruding portion 22 has an arcuate shape, both surfaces 22a and 40a are easily adapted in the used state, so that a local load on the seat 2 is applied. Can be suppressed more effectively.

In the above embodiment, the seat 2 includes a pair of rod members 15 that are separated from each other in the left-right direction and a seat side connecting member 12 that connects the pair of rod members 15 to each other, and the protruding portion 22 is on the seat side in the used state. The connecting member 12 is provided at a portion facing the leg-side connecting member 31.
According to this configuration, the seat side connecting member 12 is required to have a large strength because of the function of connecting the pair of rod members 15 to each other, but the protruding portion 22 is formed in the seat side connecting member 12. By being provided at a portion facing the leg-side connecting member 31, the robustness in a state where the protruding portion 22 and the leg-side connecting member 31 are in contact with each other (used state) can be maintained.

In the above embodiment, the seat side connecting member 12 is bent toward the pair of rod members 15 from the outer end of the seat side extending portion 20 extending in the left and right directions in the left and right directions, and is attached to the pair of rod members 15 with the seating surface 10a. Is provided with a bent portion 21 connected from the opposite side, and in a cross-sectional view orthogonal to the left-right direction, the bent portion 21 has a convex arc shape toward the side opposite to the side on which the seating surface 10a is provided.
According to this configuration, the bent portion 21 (the connecting portion of the seat side connecting member 12 to the rod member 15) has an arc shape, so that the robustness against the seating load can be maintained. For example, when a load is applied to the seat side connecting member 12 at the time of sitting, a moment load is generated centering on the connecting portion between the outer end of the seat side connecting member 12 in the width direction and the rod member 15, but the bent portion 21 is arcuate. By doing so, it is possible to maintain robustness against a moment load.

In the above embodiment, the seat side extending portion 20 has an arc-shaped recessed contact surface 46a along the guide surface 40a, and includes an elastically deformable contact portion 45 with which the protruding portion 22 abuts in the used state. ..
According to this configuration, since the contact surface 46a of the contact portion 45 has an arc shape along the guide surface 40a, the arcuate surface 22a of the protruding portion 22 and the contact surface 46a of the contact portion 45 are formed in the used state. Since it is easy to get used to, the local load on the seat 2 can be suppressed more effectively. In addition, when the protruding portion 22 comes into contact with the elastically deformable contact portion 45 in the used state, the impact such as when sitting can be absorbed by the contact portion 45.

In the above embodiment, a pair of contact portions 45 are provided at intervals in the left-right direction.
According to this configuration, since the pair of contact portions 45 are provided, the local load on the seat 2 can be suppressed more effectively. In addition, the pair of contact portions 45 can absorb the impact at the time of sitting.

[Modification example]
Although the preferred embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited to the above embodiment. The various shapes and combinations of the constituent members shown in the above-described embodiment are examples, and can be variously changed based on design requirements and the like within a range that does not deviate from the gist of the present invention.

In the above embodiment, an example in which the surface on which the chair 1 is installed is a horizontal plane has been described, but the present invention is not limited to this. For example, the chair may be installed on an inclined surface or a vertical surface that is inclined with respect to a horizontal plane.

In the above embodiment, in a cross-sectional view orthogonal to the left-right direction, the protruding portion 22 has an arcuate surface 22a forming a convex arc shape toward the side opposite to the seating surface 10a, and the guide surface 40a is an arcuate surface 22a. Although the description has been given with an example in which a dent corresponding to the convexity and an arc shape larger than the radius of curvature of the arcuate surface 22a have been described, the present invention is not limited to this. For example, as shown in FIG. 14, in a cross-sectional view orthogonal to the left-right direction, the protruding portion 122 has a V-shaped inclined surface 122a that is convex toward the side opposite to the seating surface 10a, and is a guide. The surface 140a may be recessed corresponding to the convexity of the V-shaped inclined surface 122a and may have a V shape larger than the apex angle of the V-shaped inclined surface 122a. For example, a part of the protruding portion 22 may have a concave shape, and the guide surface 40a may have a convex shape corresponding to the concave shape.

In the above embodiment, an example in which each of the arcuate surface 22a and the guide surface 40a of the protruding portion 22 has an arcuate shape has been described, but the present invention is not limited to this. For example, either one of the arcuate surface 22a and the guide surface 40a of the protrusion 22 may have an arcuate shape. For example, the protruding portion 22 may have a V-shaped inclined surface, and only the guide surface 40a may have an arc shape. The shape of the protruding portion 22 and the guide surface 40a protrudes in the process of shifting from the retracted state to the used state so that the tip 22p of the protruding portion 22 is located at the target position TP in the front-rear direction while the guide surface 40a is in use. Various changes can be made according to the required specifications within the range in which the unit 22 can be guided.

In the above embodiment, the seat 2 includes a pair of rod members 15 that are separated from each other in the left-right direction and a seat side connecting member 12 that connects the pair of rod members 15 to each other, and the protruding portion 22 is on the seat side in the used state. The description has been given with reference to an example in which the connecting member 12 is provided at a portion facing the leg-side connecting member 31, but the present invention is not limited to this. For example, the protruding portion 22 may be provided at a portion where the seat-side connecting member 12 does not face the leg-side connecting member 31 in the used state. For example, the protruding portion 22 may be provided at a portion where the seat side connecting member 12 faces a member different from the leg side connecting member 31 (another member connected to the leg side connecting member 31) in the used state.

In the above embodiment, the seat-side connecting member 12 is bent toward the pair of rod members 15 from the outer end in the left-right direction of the seat-side extending portion 20 extending in the left-right direction, and is attached to the pair of rod members 15 with the seating surface 10a. Is an example in which a bent portion 21 connected from the opposite side is provided, and the bent portion 21 has a convex arc shape toward the side opposite to the side on which the seating surface 10a is provided in a cross-sectional view orthogonal to the left-right direction. However, it is not limited to this. For example, in a cross-sectional view orthogonal to the left-right direction, the bent portion 21 may have a convex arc shape toward the seating surface 10a. For example, the bent portion 21 may have a rectangular shape in a cross-sectional view orthogonal to the left-right direction. The cross-sectional shape of the bent portion 21 can be variously changed according to the required specifications.

In the above embodiment, the seat side extending portion 20 has an arc-shaped recessed contact surface 46a along the guide surface 40a, and includes an elastically deformable contact portion 45 with which the protruding portion 22 abuts in the used state. The explanation has been given with an example, but the explanation is not limited to this. For example, the seat-side extending portion 20 does not have to have the abutting portion 45.

In the above embodiment, a pair of abutting portions 45 are provided at intervals in the left-right direction, but the present invention is not limited to this. For example, only one contact portion 45 may be provided, or a plurality of three or more contact portions 45 may be provided. The number of contact portions 45 to be installed can be variously changed according to the required specifications.

1 ... Chair, 2 ... Seat, 3 ... Support structure, 10a ... Seating surface, 12 ... Seat side connecting member, 12a ... Seat side facing surface (part where the seat side connecting member faces the leg side connecting member in use) , 15 ... Chair material, 20 ... Seat side extending part (extending part), 21 ... Bending part, 22 ... Protruding part, 22a ... Arc-shaped surface, 30 ... Leg component, 31 ... Leg side connecting member, 40a ... Guide Surface, 45 ... contact portion, 46a ... contact surface, 122 ... protrusion, 140a ... guide surface, TP ... target position

Claims (6)

A seat with a seating surface that allows the seated person to sit,
A support structure for rotatably supporting the seat about an axis along the width direction of the chair between a used state in which the seated person can be seated and a stored state in which the seat is erected with respect to the used state is provided.
The seat has a protrusion that projects toward the side opposite to the seating surface.
The support structure includes leg-side connecting members that connect the pair of leg components that are separated from each other in the width direction.
The leg-side connecting member guides the protruding portion in the process of shifting the seat from the stored state to the used state so that the tip of the protruding portion is located at a target position in the depth direction of the chair in the used state. A chair characterized by having a guide surface. In a cross-sectional view orthogonal to the width direction
The protrusion has an arcuate surface that is convex toward the side opposite to the seating surface.
The chair according to claim 1, wherein the guide surface is recessed corresponding to the convexity of the arcuate surface and has an arc shape larger than the radius of curvature of the arcuate surface. The seat is
A pair of rods separated in the width direction and
A seat-side connecting member for connecting the pair of rod members to each other is provided.
The chair according to claim 1 or 2, wherein the protruding portion is provided at a portion where the seat-side connecting member faces the leg-side connecting member in the used state. The seat side connecting member
The extending portion extending in the width direction and
A bent portion that bends from the outer end of the extending portion in the width direction toward the pair of rod members and is connected to the pair of rod members from a side opposite to the side on which the seating surface is provided. Prepare,
The chair according to claim 3, wherein the bent portion has a convex arc shape toward the side opposite to the seating surface in a cross-sectional view orthogonal to the width direction. 4. The extending portion has an arc-shaped recessed abutting surface along the guide surface, and is provided with an elastically deformable abutting portion with which the protruding portion abuts in the used state. The chair described in. The chair according to claim 5, wherein a plurality of the contact portions are provided at intervals in the width direction.

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